/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The ASF licenses this file to you under the Apache License, Version
 * 2.0 (the "License"); you may not use this file except in compliance with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */

package org.apache.storm.streams.operations.mappers;

import org.apache.storm.tuple.Tuple;

/**
 * Extracts a single typed value from a tuple.
 *
 * @param <T> the value type
 */
public class ValueMapper<T> implements TupleValueMapper<T> {
    private final int index;

    /**
     * Constructs a new {@link ValueMapper} that extracts the value at index 'i' from a tuple.
     *
     * @param index the index
     */
    public ValueMapper(int index) {
        this.index = index;
    }

    @SuppressWarnings("unchecked")
    @Override
    public T apply(Tuple input) {
        return (T) input.getValue(index);
    }
}
